Method of heating



(No Model.) 3 Sheets--Sheet 1.

G. L. GOFFIN; METHOD OF HEATING, WELDING, 0R WORKING METALS BLEGTRIGALLY.

Patented May 22, 1894.

VITA/E5858 (No Model.) 3 SheetsSheet 2.

G. L. GOFFIN. METHOD OF HEATING, WELDING, 0R WORKING METALS ELBGTRIGALLY.

Patented May 22, 1894.

WHWE'SSES I ENTOT? mud/M (No Model.) 3 SheetsSheet 3. v

C. L. GOFFIN. METHOD OF HEATING WELDING, OR WORKING METALS ELEGTRIG ALLY.

No. 520,300. Patented May'ZZ, 1894.,

WHWESSES hadd. AW

m NATIONAL muocnnnma COMPANY.

yuswmamu n c UNITED STATES PATENT OFFICE.

CHARLES L. COFFIN, OF DETROIT, MICHIGAN.

METHOD OF HEATING, WELDING, OR WORKING METALS ELECTRICALLY.

SPECIFICATION forming part of Letters Patent No. 520,300, dated May 22, 1894.

Application filed October '7, 1893- Serial No. 487,463. (No specimens.)

To all whom it may concern.-

Be it known that I, CHARLES L. 00mm, of Detroit, in the county of "Wayne and State of Michigan, have invented a new and useful Improvement in Methods of Heating, Welding, or Working Metals Electrically, of which the following is a specification.

My invention consists in an improvement in method of and apparatus for heating, welding, or working metals by electricity, hereinafter fully described and claimed.

Figures 1 and 3 are side elevations of apparatus which may be used to practice my invention. zz, Figs. 1 and 3 respectively. Fig. 5 is a side elevation showing a modified form of apparatus, and Fig. 6 is a section on line zz, Fig. 5.

A represents a table or support, on which is carried the material B to be heated, which may be insulated from table A.

J represents a goose-neck or standard rising from table A.

K represents a collar at the end of standard J.

N represents a rod which passes through collar K. For convenience in raising and lowering the electrodes, rod N may be screw threaded and engage with a threaded nut M rotatably held on collar K by lugs L, but many other ways of raising and lowering the electrodes may be used.

I represents insulation.

0. represents a series of electrodes, preferably carbon, supported by rod N but insulated therefrom. Electrodes C are insulated from each other, and each carries a contact plate G.

In Figs. 1 and 2, electrodes 0 are grouped in a circle, and in Figs. 3 and 4 they are arranged in line.

D represents a movable conductor, connected with one terminal of a generator of electricity, carrying a brush F adapted to make contact with one of the contact plates G.

With the arrangement shown in Figs. 1 and 2, conductor D may be a pulley loosely mounted on rod N, but insulated therefrom and from the electrodes 0, and in the electrical contact with an insulated contact plate E, which is connected by conductor a: with one terminal of the generator. With the arrangement of Figs. 3, 4E, and 5, plate E is made in the form of a rod on which conductor D slides, or with the arrangement of Fig. 5, con- Figs. 2 and 4: are sections on line ductor D may be directly connectedwith the generator, contact E being omitted.

In using the mechanism of Figs. 1 and 3, the voltaic arc is formed between the ,electrodes C and the material B, while in using the mechanism of Fig. 5, the material B is not in circuit.

The operation of my invention is as follows, having special reference to Figs. 1 and 3: Material B being placed in position the electrodes 0 are lowered to make contact therewith, and current is turned on, the circuit being through conductor y, material B, one electrode 0, brush F, conductor D, contact E, conductor 00, and the generator. When the circuit is established, the electrodes 0 are raised by nut M and collar N and a voltaic arc is formed between material B and one of the electrodes. Conductor D is now moved, and by a band or belt P, Fig. 1, or by sliding it along rod E. Fig. 3, cutting theelectrodes G in and out of circuit successively and causing the arc to shift its position from the end of one electrode 0 to the end of the next electrode, thus causing the arc to travel a predetermined path, and rendering it easy to heat a seam of considerable length with a very small power.

l/Vith the arrangement of Fig. 5, the electrode T, which is as wide as all the electrodes 0, is brought into contact with one of the electrodes 0, by any convenient means, such as shaft 25 and screw nut V, and then separated, forming a voltaic arc, and then conductor D is moved causing the arc to shift along electrode I as electrodes Care successively cut in and out of the circuit.

. I do not herein claim the apparatus de scribed and shown, as such constitutes the subject-matter of my application for Letters Patent filed October 5, 1893, Serial No. 487,242.

lVhat I claim as my invention, and desire to secure by Letters Patent, is

The herein described method of heating metal, consisting in subjecting the metal to the influence of a moving voltaic arc while simultaneously heated by radiation from incandescent electrodes in proximity to, but not in contact with the metal.

CHARLES L. COFFIN.

Witnesses: CHARLES E. LOTHROP, AMELIA WILLIAMS. 

